As Richard says the FAS-DPD kit is the better bet since you can accurately measure very small amounts of Chlorine (.2 ppm) and also high levels as well (50 ppm). The DPD and OTO kits do not give you that luxury. To give you an idea of how good the price might be you can go to Taylor's web site for pricing. Keep in mind the reagents have a shelf life so be cautious about the "Good Deal" Here is the web site for Taylor. http://www.taylortechnologies.com/pool-spa.asp

Look at the K-2006 ($68.95) --- Also Taylor ships same day and free if order is over $50.00 (if I remember correctly).

By all means get a good kit!!!!